Method of jigging and doweling patterns



May 5, 1931. I LAUKEL 1,803,478

METHOD OF JIGGING AND DOWELING PATTERNS Filed June 21, 1928 Patented May5, 1931 UNITED STATES ARTHUR K. LAUKEL, OF J JETROIT, MICHIGANIlltlIIilTHOLD F JIGGING AND .DOWELIN G PATTERNS Application filed. June21, 1928. Serial No. 287,315.

The present invention pertainsto a novel method of jigging and dowelingpatterns, machining the parting surfaces and filing off the burrs,particularly patterns made by electrolytic deposition by the meansdescribed in my copendingapplications. Such deposited patterns are madeon suitably shaped cathodes in an electrolytic bath, and preferably inthe formof half sections or angular partings which must be trimmed andmatched in order to form a complete pattern.

The objects of the invention are to provide jigs for holding the halfsections during machining of the parting surfaces thereof,'to

match the sections and dowel them together by means of the jigs, andfinally to file or grind the edges at the parting surfaces of twosections at one time while doweled together.

The invention is fully disclosed by way of example in the followingdescription and in the accompanying drawings; in which Figure 1 is aplan view of a box in which a split section of the working pattern ismounted;

Fig. 2 is a longitudinal section thereof,'

the box being filled with plastic material packed around the patternsection;

Fig. 3 is a similar sectional view showing the same plastic material andpattern inverted, and a superposed matched pattern section also embeddedin plastic material;

Fig. 4 is a longitudinal section of the lower east in Figure 3, with adepositedpattern section inserted therein; I

Fig. 5 is a similar sectional view of the upper cast of Figure 3,inverted, and having a deposited pattern section fitted therein;

Fig. 6 is a sectional viewcorresponding to Figure 4 and showing thedeposited pattern section trimmed on its parting face;

Fig. 7 is a sectional view corresponding to Figure 5 and showing thedeposited pattern section trimmed on its parting face;

Fig. 8 is a sectional view showing one of the trimmed pattern sectionsand its cast superposed over the other pattern section and cast;

Fig. 9 is a perspective View of one of the pattern sections prior tobeing trimmed;

Fig. 10 is a sectional. view of the pattern prior to filing or scrapingoff the burrs; and

Fig. 11 is a perspective view of the compjlpt'e deposited pattern withthe burrs filed 0 Reference to these views will now be made by use oflike characters which are employed to designate corresponding partsthroughout.

In Figures 1 and 2 is illustrated a base plate 1 on which is mounted anenclosingwall 2 forming a box.

A section 30f a split working pattern is laid upon the base and issuitably apertured as at 4 to receive dowel pins extendingfrom theremaining section; Such sections are formed by merely splitting thepattern in a manner Well known in the art, and will be referred tothroughout the specificationand claims as split sections. 7

On the base 1, preferably at theends of the section 3,-are laid socketof female members 5 having their'openingsat the base. The enclosure isnow filled with plastic material 6, such asplaster, packed around themem-- ber 3 in order to form a depression 7 which is a true and accuratecounterpart of theouter surface of the section 3. At the same time thesocket members 5 are also embedded in the plastic materiaL- l 1 When thematerial 6 has set, the base plate 1 may be removed, and the cast withits associated parts is inverted as in Figure 3 and obviously supportedin this position by any suitable means. The remaining split section 8 ofthe working pattern is superposed on the section 3 and is matched oraligned therewith by means of dowel pins 9 which extend into theapertures 4 previously mentioned, and which are so related to theapertures 4 as to match or align the pattern sections.

The doweling of pattern sect-ions for the purpose of bringing thesections into proper mutual relation, is well known in the art or withtheir parting surfaces coincident, and the positioning of the sectionsin this relation is hereinafter referred to as aligning or matching.

Studs 10 are fitted into the sockets 5, a wall 11 is placed over thewall 2, and the enclosure thus formed is filled with plastic material 12which is packed around the members 8 and 10 in the manner alreadydescribed. When the material 12 has set, the casts are separated and,with the parting face of the section therein as a supporting surface,the backs 6 and 12 thereof are planed or machined off parallel to theparting planes. This operation may be performed, for example, in amilling machine. The split sections 3 and 8 of the working pattern arenow removed, but the locating elements 5 and 10 are allowed to remain.

Into the depressions of the two casts are fitted metallic patternsections 13 of external dimensions equal to those of the sections 3 and8. These sections are formed by electrodeposition on cathodes havingdepressions identical to those in the casts and rendered conductive inthe manner set forth in my prior patents and applications. In fact theelectrodes may be duplicates of the casts, but with the depressions andadjacent areas rendered conductive. The sections 13 have each anoutwardly extending flange 14; formed at a conductive area around thedepression. It will be obvious that the sections 13 will fit accuratelyinto the depressions in the casts. The sections 13 are filled with asuitable low fusing metal 15, preferably before being put into thecasts, for the purpose of reinforcement.

After the sections 13 have been positioned in the casts, the casts areemployed as jigs for machining oi the parting surfaces, preferably inparallelism with the backs 6 and 12'. In this manner the flanges 14 aretrimmed down to the level of the parting or depressed faces 17 as shownin Figures 6 and 7. If amilling machine has been used in levelling offthe backs 6 and 12, the casts or jigs may be put into the same machine,with the same adjustment, but resting on the backs so that the depressedfaces are presented to the cutter.

The operation of the cutting tool forms a marginal burr or wire edge 18at the parting face of each metal section, and this burr is accommodatedin a groove 19 formed in the cast prior to the insertion of the metalsection 13 therein.

The casts are now superposed one over the other so that the studs 10enter the sockets 5 as shown in Figure 8. Due to the fact that theworking pattern sections 3 and 8 were matched at the same time that thestud-s 10 entered the sockets 5 in Figure 3, the registration of thestuds with the sockets in Figure 8 brings the deposited sections 14 alsoin alignment. WVhile the sections are aligned, a hole 21 is drilledthrough each, and dowel pins 22 are fitted into the holes to maintainthe sections in alignment after they have been removed from the casts.If preferred, a larger hole 23 may be drilled in the upper cast prior todrilling the holes 21. While doweled together the patterns are givenwhatever machining operations may be necessary, consisting for the mostpart of filing or scraping off the burrs or wire edges. By this means,both pattern sections have their burrs removed in a single operation,and there is no danger of rounding off the parting edges as would be thecase if the pattern sections were singly filed or ground.

Figure 10 shows the aligned metal sections removed from the cast andheld in proper relation by the dowel pins 22' prior to removal of theburrs, while Figure 11 shows the sections in the same relation but withthe burr removed.

It will be evident from the foregoing that the casts are used as jigs inwhich the pattern sections are mounted for levelling off the partingsurfaces and dowelingthe sections together. It is to be remarked in thisconnection that the electrolytic process of making patterns, by themeans described in my copending applications, is so accurate that onejig may be used for any number of patterns 7 reproduced from a givenworking pattern.

Plaster of Paris is used in forming the cast or jig when the pattern isfairly large, or when only a small number of patterns are to bemachined. For a large number of patterns a plaster jig would probablynot stand repetitious use, and in such instances a low melting whitemetal jig is made. If the model working pattern is of white metal orwood, it cannot very well be covered with molten white metal to form acast; and if in such cases a metal jig is wanted, it is made from one ofthe metal patterns produced by the electrolytic process. A white metaljig is also preferable when a large number of large patterns are to bemachined.

The term cast throughout the claims refers to the body, whether plasteror white metal, in which the pattern section is held while beingtrimmed.

Although a specific embodiment of the invention has been illustrated anddescribed, it will be understood that various alterations in the detailsof construction may be made with out departing from the scope of theinvention as indicated by the appended claims.

What I claim is 1.7 A method of jigging and trimming patterns consistingin forming impressions of split and aligned sections of a workingpattern in casts equipped with aligning means, removing said sectionsfrom the depressions and placing in said depressions thus formed,metallic pattern sections of similar exterior dimensions to the workingpattern sections, and trimming the parting surfaces of said metalsections while in the casts.

2. A method of doweling patterns consisting in forming impressions ofsplit and aligned sections of a working pattern in casts equipped withaligning means, removing said sections from the depressions and placingin said depressions thus formed metallic pattern sections of similarexterior dimensions to the working pattern sections, trimming theparting surfaces of said metal sections while in the casts, superposingone of said casts over the other in alignment, with the metal sectionscontained therein, and forming aligning means in said metal sectionswhile superposed and in the casts.

3. A method of doweling patterns consisting in forming impressions ofsplit and aligned sections of a working pattern in casts equipped withaligning means, removing said sections from the depressions and placingin said depressions thus formed metallic pattern sections of similarexterior dimensions to the working pattern sections, trimming theparting surfaces of said metal sections while in the casts, superposingone of said casts over the other in alignment with the metal sectionscontained therein, and drilling dowel holes through said metal sectionswhile thus superposed and in the casts. we

4. A method of doweling patterns consisting in forming impressions ofsplit and aligned sections of a working pattern in casts equipped withaligning means, removing said sections from the depressions and placingin said depressions thus formed electrolytically deposited patternsections of similar exterior dimensions to said working patternsections, trimming the parting surfaces of said deposited sections whilein the casts, superposing one of said casts over the other in alignment,with the deposited sections contained therein, and forming aligningmeans in said deposited sections while superposed and in the casts.

5; A method of jigging patterns consisting in forming impressions ofsplit'and aligned sections of a working pattern in casts equipped withaligning means, levelling the backs of the casts to parallelism with theparting plane of said sections, removing said sections from thedepressions thus formed, and placing in said depressions metallic shellpattern sections of similar exterior dimensions to the Working patternsections.

6. A method of doweling patterns consisting in impressing a splitsection of a working pattern in a plastic cast, superposing anothersplit section on the first section and in matched registrationtherewith, forming a cast around said superposed section and aligningsaid cast ing in impressing a split section of a working pattern in aplastic cast, superposing another split section on the first section andin matched registration therewith, forming a cast around said superposedsection and aligning said cast with the first named cast, separating thecasts when set and removing said pattern sections therefrom, insertingin the impressions electrolytically deposited split pattern sections ofthe same exterior dimensions as said working pattern sections, trimmingsaid deposited sections on the parting surfaces while in the casts,matching said casts while the deposited sections are contained therein,and forming aligning means in said deposited sections while superposedand in the casts.

8. A method of doweling and trimming patterns consisting in formingimpressions of split and aligned sections of a working pattern in castsequipped with aligning means, removing said sections from thedepressions thus formed and placing in said depressions metallic shellpattern sections of similar exterior dimensions to the working patternsections, trimming the parting surfaces of said metal sections while inthe casts, superposing one of said casts over the other in alignmentwith the metal sections contained therein, doweling the sectionstogether while superposed and in the casts, and trimming the partingedges of said sections while doweled together.

9. A method of doweling and trimming patterns consisting in formingimpressions of split and aligned sections of a working pattern in castsequipped with aligning means, removing said sections from thedepressions and placing in said depressions thus formed electrolyticallydeposited pattern sections, trimming the parting surfaces of saiddeposited sections while in the casts, superposing one of said castsover the'other in alignment, with the deposited sections containedtherein, doweling the sections together while superposed and in thecasts, and trimming the parting edges of said sections while doweledtogether.

10; A method of jigging patterns consisting in forming impressions ofsplit and aligned sections of a working pattern in casts, insertingaligning means in said casts during the formation thereof, removing thesections from the depressions thus formed, and placing in saiddepressions metallic pattern sections mensions as said workingpattern'sections,

trimming said metal sections on the parting surfaces while in the casts,matching said casts while the metal sections are contained therein, andforming aligning means in said metal sections while superposed and inthe casts.

7. A method of doweling patterns consist-

